Lamp-shade and light-diffuser



E. HL STRAUSS.

LAMP SHADE AND LIGHT DIFFUSER.

APPLICATION FILED IUNE I8, 1911.4

Patented Jan. 27, 1920.

4 SHEETS-SHEET I [NVE OR.

RNEY

WI TN ESSES E. H. STRAUSS.

LAMP SHADE AND LIGHT DIFFUSEH.

l 1,329,147. i Patented Jan.27,1920/ 4 SHEETS-SHEET 2- 1N VNTOR.

` WITNEssEs.- i

E. H. STHAUSS.

LAMP SHADE AND LIGHT DIFFUSER.

APPLicATloN 111ED111NE18.1911.

' 'Patented Jan. 27,1920.

4 SHEETS-SHEET 3.

W l TNESSES ERNEST H. STRAUSS, 0F CHICAGO, ILLINOIS.

LAMP-SHADE AND LIGHT-DIFFUSER.

Specification of Letters Patent. Patented Jan, 27, 1920,

Application led June 18, 19,17. Serial No. 175,473.

To all whom 'it may concern Be it known that I, ERNEST I-I. STRAUss, a. citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in LanipLSliades and Light-Diffusers, of which the'following is a specification.

My invention relates to lamps generally, but particularly to lamps in the case of which it is sometimes necessaryto look at or in the direction of the source of the light, and has for its object the production of a. shade and diffuser which will give the maximum light in any given direction or directions, with little or no glare' to the eyes upon looking at or inthe direction of the source of the light.

I attain these objects by a shade and diffuser illustrated in the accompanying drawings, in which Figure 1 is an elevation of a typical segment; Fig. 2 of a segment with one end closed; Fig. 3 a cross section of the same showing three tyfpes (a, b and c) of corrugation of the di user proper; Fig. 4 shows the device mounted on a bracket and suspended so as to serve a desk or work bench; Fig. 5 shows a mounting of the device on a standard; Figs. 6 and 7 show segments of the faces of the corrugations shown in cross section in Fig. 3. Figs. 8 and 9 show the faces of possible assemblings and mountings of the diffuser; Fig,`10 is an elevation of the mounting shown in Fig. 9; Fig. 11 shows in simple form how the diffuser may be built into the walls of a room, and Figs. l2 and 13 show the device in possible foi-ms of chandeliers. The same reference characters refer to the same, similar or corresponding parts throughout the various views.

The device consists of a diffuser proper, a reflector, and, in certain forms, a shade. The diffuser proper is made of lass with longitudinal corrugations having t ose sides of the crests on which light rays fall directly from the source or sources of the light, frosted, so as to diffuse them, but having the other sides, or those upon which indirect or reflected rays fall, clear or transarent, so as to permit their passage with little or no absorption; while the shade is made of glass, metal or other material according to the effect desired and has its inner surface silvered or otherwise treated so as to act as a reflector. When the reflector is made of glass it is preferably continuous so as to make one piece with the diffuser proper.

Referring to the drawings, A is the ydiffuser; B is the shade; C the reflector; D are the frosted or translucent sides of the corrugatioiis; E the sides that are clear or transparent; and F represents the arc filament or other source of light.

It will be observedthat the slope or pitch of the corrugations is such, in reference to the position or positions of the sourceror sources of light, (which are arranged immediately above the middle longitudinal line of the diffusen) that only direct rays fall on the sides of the corrugations that are frosted, thus preventing the glare to the eyes when looking at or in the direction of the source of the light; while the reflected or indirect rays (or most of them) will fall upon and pass relatively unhindered through those sides of the corrugations which are clear or transparent, thus furnishing a minimum of glare together with a maximum of light.

The form of corrugation which is most effective (because offering the widest clear passage for reflected rays,) is that in which the sides of the corrugations which are frosted are approximately vertical or at right angles to the general plane of the diffuser, as shown in Fig. 3 a and b.

It is of course understood that modifications may be resorted to, such as making the corrugations latitudinal, diagonal, radial or even vertical, without departing materially from the scope or spirit of this invention, and such modifications are included herein.

Having thus described my invention, I claim:

1. An oblong diffuser corrugated longitudinally and having the sides of the corrugations upon which the direct rays fall frosted so as to diuse them, and the sides upon which reflected rays fall, clear so as to permit them to pass Without absorption, the said frosted sides being approximately perpendicular to the general plane of the diffuser so that the clear sides may be as wide as possible, and said diffuser being backed by a reflector of corresponding size and shape and, together with the reflector, inclosmg the source of light, which is so disposed with reference to the corrugations as that no direct rays will pass through the clear sides thereo 2. A combination of oblong diiusers corrugated longitudinally, and having the sides of the corrugations upon which direct rays fall frosted so as to diffuse them, and those upon which refiected rays fall, clear so as to pass them without absorption, the said difuseis being-backed by 'reflectors of corresponding size and shapeand, together with the reectors, inclosing the sources of li ht, which are so disposed above the middle ongi-tudnal of the di'users as that no direct rays will fall upon the clear sides `of their eorrugations.

3. A combination of oblong difusers corf rugated longitudinally, and having the sides of the corrugations upon which dlrect ra s fall frosted so as to diffuse them, and t e sides upon which refiected rays fall, clear so as to permit them to pass without absorption, the said frosted sides being approximately erpendicular to the general plane of the diiisers so that the clear sides may be as wide as possible, and the di'users being `backedby reliectors of corresponding size and shape and,itogether with said reflectors, inclosing the souroes of light, which are so disposed with referenze \to :the'eorrugations that no direct rays will -:fell upon the clear sides therwf.

In witness whereof Ifhave hereunto set my hand at Chicago, Illinois, the 13thday of June, 1917.

ERNEST H. STBAUSS. 

